Python factorial examples

Examples Python3

Integer factorial (English: factorial) are all less than and equal to the product of the number of positive integers, the factorial of 0 is 1. That is: n = 1 × 2 × 3 × ... × n!.

# -*- coding: UTF-8 -*-

# Filename : test.py
# author by : www.w3big.com

# 通过用户输入数字计算阶乘

# 获取用户输入的数字
num = int(input("请输入一个数字: "))
factorial = 1

# 查看数字是负数，0 或 正数
if num < 0:
   print("抱歉，负数没有阶乘")
elif num == 0:
   print("0 的阶乘为 1")
else:
   for i in range(1,num + 1):
       factorial = factorial*i
   print("%d 的阶乘为 %d" %(num,factorial))

Execute the above code output results:

请输入一个数字: 3
3 的阶乘为 6

Examples Python3